A polymerisation process

C - Chemistry – Metallurgy – 08 – F

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C08F 20/12 (2006.01) C08F 4/26 (2006.01) C08F 4/44 (2006.01) C08F 4/605 (2006.01) C08F 4/80 (2006.01) C08F 10/02 (2006.01)

Patent

CA 2335754

A polymerisation process for the preparation of vinylic polymers from the corresponding vinylic monomers which process comprises the step of reacting a vinylic monomer in the presence of a catalyst system comprising a) a metal complex of general formula (I) where A is selected from the group consisting of nickel, iron, cobalt, chromium, manganese, titanium, zirconium, vanadium and the rare earth metals; L1, L2, L3 and L4 are ligands and b) a Lewis acid of general formula (II) wherein at least one of W, Y or Z is capable of formming a co-ordination bond with A and the others of W, Y and Z are bulky groups; D is selected from the group consisting of aluminium, magnesium, zinc and boron.

L'invention concerne un procédé de polymérisation pour la préparation de polymères vinyliques à partir des monomères vinyliques correspondants. Ledit procédé consiste à faire réagir un monomère vinylique en présence d'un système catalytique comprenant : a) un complexe métallique de formule générale (I) dans laquelle A est choisi dans le groupe constitué de nickel, fer, cobalt, chrome, manganèse, titane, zirconium, vanadium et les métaux de terres rares ; L?1¿, L?2¿, L?3¿ et L?4¿ représentent des ligands et b) un acide de Lewis de formule générale (II) dans laquelle au moins parmi W, Y ou Z est capable de former une liaison de coordination avec A et les autres parmi W, Y et Z sont des groupes encombrants ; D est choisi dans le groupe constitué d'aluminium, de magnésium, de zinc et de bore.

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